Mohiuddin Soliman

Bio: Mohiuddin Soliman is an academic researcher from International Islamic University, Islamabad. The author has contributed to research in topics: Antenna efficiency & Antenna (radio). The author has an hindex of 1, co-authored 10 publications receiving 2 citations. Previous affiliations of Mohiuddin Soliman include International Islamic University, Chittagong & National University of Malaysia.

Review on Medical Implantable Antenna Technology and Imminent Research Challenges

Abstract: Implantable antennas are mandatory to transfer data from implants to the external world wirelessly. Smart implants can be used to monitor and diagnose the medical conditions of the patient. The dispersion of the dielectric constant of the tissues and variability of organ structures of the human body absorb most of the antenna radiation. Consequently, implanting an antenna inside the human body is a very challenging task. The design of the antenna is required to fulfill several conditions, such as miniaturization of the antenna dimension, biocompatibility, the satisfaction of the Specific Absorption Rate (SAR), and efficient radiation characteristics. The asymmetric hostile human body environment makes implant antenna technology even more challenging. This paper aims to summarize the recent implantable antenna technologies for medical applications and highlight the major research challenges. Also, it highlights the required technology and the frequency band, and the factors that can affect the radio frequency propagation through human body tissue. It includes a demonstration of a parametric literature investigation of the implantable antennas developed. Furthermore, fabrication and implantation methods of the antenna inside the human body are summarized elaborately. This extensive summary of the medical implantable antenna technology will help in understanding the prospects and challenges of this technology.

Optimization of Design Parameters of Microstrip Patch Antenna at 28 GHz and 38 GHz for 5G Applications

Abstract: This paper has found out optimized value of design parameters of microstrip patch antenna (MPA) at 28 GHz and 38 GHz for 5G applications. Three design parameters namely: substrate element, substrate height and feeding technique have significant effect on antenna performance. If these are not suitably elected, the 5G requirements won't be covered. This work has found out the optimized value of substrate element, substrate height and feeding technique as design parameters for designing MPA at 28 GHz and 38 GHz which fulfill the 5G requirements. In addition, a comparative observation of antenna performance is done among the antennas which are designed based on these three design parameter values. Foam as substrate element, substrate height 0.5 mm and quarter wave transformer feeding technique have been found as the best performance provider at 28 GHz and 38 GHz frequency bands as per 5G requirement. In conclusion, Single element Antenna is designed on 28 GHz and 38 GHz using aforementioned best performance provider design parameter values.

Design of UWB Microstrip Patch Antenna with Variable Band Notched Characteristic for Wi-MAX Application

Abstract: Microstrip patch antenna (MPA) having UltraWide Band characteristics is a worthy applicant in wireless communications. Mitigating EMI with the narrowband such as 5G lower band, Wi-MAX, WLAN, Satellite band lies in UWB region is a major research concern. This paper presents an UWB antenna containing variable band rejection for avoiding interference with Wi-MAX application. A simple rectangle patch antenna with defective ground structure is used to design UWB characteristics operating from 2.7 GHz – 13 GHz. Band rejections from 3.25 GHz to 3.8 GHz are obtained by utilizing semi-circular slot on radiating patch. Variable band rejection characteristic can be achieved in between 2.75 GHz – 4.4 GHz through altering the value of width of patch. The return loss and VSWR values over the band rejection frequency are close to 0 dB and greater than 2 respectively. In addition, the proposed UWB antenna obtained 85% radiation efficiency over the operating frequency, on the other hand, less than 53% radiation efficiency achieved over band rejection frequency. The proposed antenna is simple in design, compact in size, and efficient in radiation. Hence it is a good candidate on UWB antenna with band notch characteristic for Wi-MAX application.

Investigation of Signal Penetration Loss Variation on Different Building Components and Disparity of Receiver Location on 3G/4G Network in the Context of Bangladesh

Abstract: In most cases, the cellphone signal level is found weak inside a building than outside due to signal dropping caused by penetration. Because of penetration loss, the indoor cellular network signal shows poor performance, and imperfect reception occurs. Penetration loss is influenced by the building material types used in construction, the building structure, and orientation. In this work, the penetration loss was measured subject to construction materials and different network bands, i.e. UMTS and LTE on 3G and 4G network. The measurements were taken from a multi-storied building and a multi-storied mud house located in a rural area in Chattogram district of Bangladesh. This work was done in respect of Bangladesh, where most of the areas are rural; therefore, the rural area was taken as standard. Android mobile with an installed application named "Network Signal Info" and LTE/4G/3G network supported SIM of a primary cellular network service provider in Bangladesh named 'Robi Axiata' was used to measure the data. Penetration loss fluctuation on the variation of the receiver height (floor to floor) and the Base station (BS)-Rx distance (room to room) was accounted as evaluation metrics to measure and study the signal strength performance. It is observed from the resultant data that; the increment of receiver height reduces the penetration loss where the increment of BS-Rx distance exacerbates this loss. By comparison, it is also found that penetration loss is always higher in 4G networks than 3G network band from all aspects. Besides, the mud constructed house gives higher penetration loss compared to the brick constructed building for each parameter.

Distributed Framework via Block-chain Smart Contracts for Smart Grid Systems against Cyber-Attacks

Abstract: In this century, the demand for energy is increasing daily, and the need for energy resources has become urgent and inevitable. New ways of generating energy, such as renewable resources that depend on many sources, including the sun and wind energy will contribute to the future of humankind largely and effectively. These renewable sources are facing major challenges that cannot be ignored which also require more researches on appropriate solutions . This has led to the emergence of a new type of network user called prosumer, which causes new challenges such as the intermittent nature of renewable. Smart grids have emerged as a solution to integrate these distributed energy sources. It also provides a mechanism to maintain safety and security for power supply networks. The main idea of smart grids is to facilitate local production and consumption By customers and consumers.Distributed ledger technology (DLT) or Block-chain technology has evolved dramatically since 2008 that coincided with the birth of its first application Bitcoin, which is the first cryptocurrency. This innovation led to sparked in the digital revolution, which provides decentralization, security, and democratization of information storage and transfer systems across numerous sectors/industries. Block-chain can be applied for the sake of the durability and safety of energy systems. In this paper, we will propose a new distributed framework that provides protection based on block-chain technology for energy systems to enhance self-defense capability against those cyber-attacks.

Response to FCC 98-208 notice of inquiry in the matter of revision of part 15 of the commission's rules regarding ultra-wideband transmission systems

Abstract: In general, Micropower Impulse Radar (MIR) depends on Ultra-Wideband (UWB) transmission systems. UWB technology can supply innovative new systems and products that have an obvious value for radar and communications uses. Important applications include bridge-deck inspection systems, ground penetrating radar, mine detection, and precise distance resolution for such things as liquid level measurement. Most of these UWB inspection and measurement methods have some unique qualities, which need to be pursued. Therefore, in considering changes to Part 15 the FCC needs to take into account the unique features of UWB technology. MIR is applicable to two general types of UWB systems: radar systems and communications systems. Currently LLNL and its licensees are focusing on radar or radar type systems. LLNL is evaluating MIR for specialized communication systems. MIR is a relatively low power technology. Therefore, MIR systems seem to have a low potential for causing harmful interference to other users of the spectrum since the transmitted signal is spread over a wide bandwidth, which results in a relatively low spectral power density.

Smart contracts in energy systems: A systematic review of fundamental approaches and implementations

Abstract: Given the ongoing transition towards a more decentralised and adaptive energy system, the potential of blockchain-enabled smart contracts for the energy sector is being increasingly recognised. Due to their self-executing, customisable and tamper-proof nature, they are seen as a key technology for enabling the transition to a more efficient, transparent and transactive energy market. The applications of smart contracts include coordination of smart electric vehicle charging, automated demand-side response, peer-to-peer energy trading and allocation of the control duties amongst the network operators. Nevertheless, their use in the energy sector is still in its early stages as there are many open challenges related to security, privacy, scalability and billing. In this paper, we systematically review 178 peer-reviewed publications and 13 innovation projects, providing a thorough analysis of the strengths and weaknesses of smart contracts used in the energy sector. This work offers a broad perspective on the opportunities and challenges that stakeholders using this technology face, in both current and emergent markets, such as peer-to-peer energy trading platforms. To provide a roadmap for researchers and practitioners interested in the technology, we propose a systematic model of the smart contracting process, by developing a novel 6-layer architecture, as well as presenting a sample energy contract in pseudocode form and as open-source code. Our analysis focuses on the two mainstream application areas we identify for smart contract use in this area: energy and flexibility trading, and distributed control. The paper concludes with a comprehensive, critical discussion of the advantages and challenges that must be addressed in the area of smart contracts and blockchains in energy, and a set of recommendations that researchers and developers should consider when applying smart contracts to energy system settings.

A Compact High-Gain Microstrip Patch Antenna with Improved Bandwidth for 5G Applications

Abstract: This paper presents a High Gain, enhanced Bandwidth Patch antenna for 5G operations. The dual-band is achieved using an inset-fed feeding technique for the microstrip patch antenna, which operates at the 28/38GHz millimeter-wave band. The high gain of the patch is achieved by inserting two rectangular slots on the radiating element of the patch. The designed antenna Bandwidth is improved by incorporating three steps at the edge of the rectangular patch. The substrate used for the format is Rogers RT Duroid 5880, with a thickness of 0.508mm, loss tangent of 0.0009, and a relative permittivity constant of 2.2. Ansys HFSS software is used for the simulation. The design attained a maximum gain of 8.2dB and 7.8dB at 27.84GHz and 39.32GHz. The impedance bandwidth response of 1.46 and 4.27GHz at the respective resonating frequencies below the -10dB line of the parameters are achieved. A compact antenna is proposed with a size of 3.2x4.9x0.508 and has a high Gain with a wide Bandwidth at both bands. The proposed antenna has achieved a good performance within the operating bands, making it suitable for 5G applications.

Digital-Twin-Enabled City-Model-Aware Deep Learning for Dynamic Channel Estimation in Urban Vehicular Environments

Abstract: Most of the existing works on vehicle-to-everything (V2X) communications assume some deterministic or stochastic channel models, which is unrealistic for highly-dynamic vehicular channels in urban environments under the influence of high-speed vehicle motion, intermittent connectivity, and signal attenuation in urban canyon. Enabled by the concept of digital twin, the digital replica of a real-world physical system, this paper proposes a city-model-aware deep learning algorithm for dynamic channel estimation in urban vehicular environments. Specifically, the digital twin simulation allows us to accurately model radio ray reflection and attenuation in urban canyon, and the data can be supplemented and validated with empirical measurements. Our results indicates that the city-model-aware deep neural network (CMA DNN) estimator performs much better than conventional methods and has more than 32% improvement in BER when compared with generic DNN approaches that do not take the 3D city model into account. Since some geometry-based models like ray-tracing techniques used in the digital twin simulation for dynamic channel modeling could be computational expensive, we also propose a basis expansion model (BEM) approach to simplify the computation load of the overall methodology to gain a good balance between accuracy and timeliness.

Design of UWB microstrip patch antenna with variable band notched characteristics

Abstract: Recently lower frequency band 4.5−5.5 GHz is proposed by the ASEAN countries for 5G cellular application and therefore, it is essential of designing an ultra-wideband (UWB) antenna for the particular band-notched characteristics. In this article, a compact tuning fork shape ultra-wideband (UWB) patch antenna with a variable band-notched characteristic has been proposed for 5G cellular application. The UWB antenna has been achieved by using a tuning fork shape with a simple partial ground plane. A pair of ring shape slits (RSS) on the ground plane has been added to achieve the band-notched characteristic. The proposed antenna has achieved a large −10 dB bandwidth of 7.8 GHz (2.9−11 GHz) and the VSWR value is less than 2 for the entire bandwidth excepted for notched frequency bands of lower 5G bands (4.5−5.5 GHz). Moreover, the antenna has a peak radiation efficiency of more than 87% for UWB and less than 27% for the notched frequency band. The notched-band is shifted with the change in the position of RSS’s within the vertical axis and thus, the variable band-notched characteristics have been achieved. Besides, the proposed antenna is compact with the dimension of 45×34 mm2 that makes it suitable for the lower band of 5G application.